US4951551A - Variable displacement hydraulic motor - Google Patents

Variable displacement hydraulic motor Download PDF

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Publication number
US4951551A
US4951551A US07/299,922 US29992288A US4951551A US 4951551 A US4951551 A US 4951551A US 29992288 A US29992288 A US 29992288A US 4951551 A US4951551 A US 4951551A
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US
United States
Prior art keywords
drive shaft
valve plate
hydraulic motor
axis
end portion
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/299,922
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English (en)
Inventor
Mitsuru Arai
Yoshikazu Nagahara
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Komatsu Ltd
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Komatsu Ltd
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Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Assigned to KABUSHIKI KAISHA KOMATSU SEISAKUSHO reassignment KABUSHIKI KAISHA KOMATSU SEISAKUSHO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ARAI, MITSURU, NAGAHARA, YOSHIKAZU
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Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed
    • F16D59/02—Self-acting brakes, e.g. coming into operation at a predetermined speed spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0678—Control
    • F03C1/0694—Control by changing the inclination of the axis of the cylinder barrel in relation to the axis of the actuated element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • F04B1/30—Control of machines or pumps with rotary cylinder blocks
    • F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • F04B1/328—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the axis of the cylinder barrel relative to the swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/24—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member
    • F16D55/26—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member without self-tightening action
    • F16D55/36—Brakes with a plurality of rotating discs all lying side by side
    • F16D55/40—Brakes with a plurality of rotating discs all lying side by side actuated by a fluid-pressure device arranged in or one the brake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/0058—Fully lined, i.e. braking surface extending over the entire disc circumference

Definitions

  • the present invention relates to a variable displacement hydraulic motor serving as a hydraulic drive motor mounted in a power shovel.
  • variable displacement hydraulic motors there is a bent-axis type axial-piston motor such as one disclosed, for example in U.S. Pat. No. 3,961,563.
  • the reference character M denotes such bent-axis type axial-piston motor provided with a motor housing which is constructed of a main casing 1, a motor casing 2 and an end cover 3, as shown in FIG. 1.
  • a motor housing which is constructed of a main casing 1, a motor casing 2 and an end cover 3, as shown in FIG. 1.
  • a cylinder block 6 In the motor housing is obliquely mounted a cylinder block 6 so that an axis of the cylinder block 6 forms a tilt angle with an axis of a drive shaft 7, which tilt angle is variable within a range of from 7.5° to 30° while controlled by moving a convex portion of a valve plate 8 relative to an inner concave portion 9 of the end cover 3 in a swinging manner.
  • the stroke of each of a plurality of pistons 4 is so controlled as to make it possible to change a rotational speed of the drive shaft 7 in a condition in which an output horsepower of the drive shaft 7 is kept constant, provided that an amount of hydraulic oil supplied to the hydraulic motor M is kept constant.
  • a sleeve-like housing 12 is fixedly mounted in a bore 11 of a truck frame 10.
  • a hub 14 fixed to a sprocket 13 is rotatably mounted on an outer peripheral portion of the housing 12 in which the hydraulic drive motor M is housed.
  • the drive shaft 7 of the drive motor M is connected to the hub 14 through a reduction-gear mechanism 15 so that the sprocket 13 is driven by the hydraulic drive motor M.
  • the above arrangement of the slider element 3a PG,4 requires the end cover 3 to be mounted in a tilting condition, which increases the entire length of the end cover 3 and causes the motor casing 2 to be mounted in a tilting condition too to make its machining operation difficult in manufacturing.
  • variable displacement hydraulic motor M since the overall length of the drive motor M is large, a part of the drive motor M projects outward from the truck frame 10 to often interfere with obstacles such as rock and the like.
  • the end cover 3 since the end cover 3 is obliquely mounted, the end cover 3 tends to interfere with the truck frame 10, which makes it difficult to mount the hydraulic drive motor M in the truck frame 10, and, therefore requires a complicated mounting construction for mounting the drive motor M in the truck frame 10.
  • the present invention is made so that it is an object of the present invention to provide a variable displacement hydraulic motor which does not interfere with a truck frame, nor does it project outward from the truck frame to make it possible to easily mount the hydraulic motor in the truck frame and to easily assemble and machine the hydraulic motor in manufacturing.
  • a variable displacement hydraulic motor comprising: an end cover fixedly mounted on an end surface of a substantially cylindrical main casing; a drive shaft rotatably mounted in said main casing; a center shaft and a plurality of pistons, an end portion of each of which shaft and pistons is swingably engaged with a flange portion of said drive shaft, the flange portion being formed in a rear-end portion of said drive shaft; a cylinder block for slidably receiving the other end portion of each of said pistons therein, said cylinder block being provided with a through-hole through which said center shaft passes, the through-hole being formed in a central portion of said cylinder block; a valve plate fixedly mounted on a base-end portion of said cylinder block, said valve plate being provided with a central portion in which the other end portion of said center shaft is rotatably mounted; guide means for swingably guiding said valve plate, said guide means being provided in opposite sides of an inner portion of said end cover; a swinging means for moving said valve plate in a swinging manner, said
  • FIG. 1 is a schematic longitudinal sectional view of a motor-mounting portion of a power shovel, in which portion a conventional bent-axis type axial-piston hydraulic motor is mounted;
  • FIG. 2 is a schematic longitudinal sectional view of a motor-mounting portion of a power shovel, in which portion a bent-axis type axial-piston motor constituting a variable displacement hydraulic motor of the present invention is mounted;
  • FIG. 3 is a schematic longitudinal sectional view of the bent-axis type axial-piston motor constituting the variable displacement hydraulic motor of the present invention
  • FIG. 4 is another schematic longitudinal sectional view of the bent-axis type axial-piston motor constituting the variable displacement hydraulic motor of the present invention, taken along the line 1V--1V of FIG. 3;
  • FIG. 5 is a diagram of a hydraulic circuit for the variable displacement hydraulic motor of the present invention.
  • FIGS. 2 to 5 of the accompanying drawings the present invention will be described hereinbelow in detail.
  • FIG. 2 is a schematical longitudinal sectional view of a motor-mounting portion of a power shovel, in which portion a variable displacement hydraulic drive motor M' is mounted.
  • a sleeve-like housing 32 is fixedly mounted in a hole 31 of a track frame 30 of the power shovel.
  • a hub 33 is rotatably mounted on an outer peripheral portion of the housing 32.
  • Fixedly mounted on the hub 33 is a sprocket 35 for driving a caterpillar 34 of the power shovel.
  • a first ring gear 37 which is a component of a reduction-gear mechanism 36.
  • the first ring gear 37 is meshed with a planet gear 39 which is rotatably mounted on a planet carrier 38.
  • the planet gear 39 is meshed with a second ring gear 40 which is meshed with a gear 41 fixedly mounted on the housing 32.
  • a sun gear 42 is connected to a drive shaft 44 of the variable displacement hydraulic motor M' through a coupling 43. Consequently, when the drive shaft 44 rotates, the sun gear 42 is rotatably driven by the drive shaft 44 so that the planet gear 39 is so driven that it not only rotates about its own axis but at the same time its axis rotates about an axis of the second ring gear 40.
  • the first ring gear 37 is rotatably driven by the planet gear 39 to drive the hub 33 together with the sprocket 35.
  • variable displacement hydraulic motor M' has a construction shown in FIGS. 3 to 5.
  • the drive shaft 44 is rotatably mounted on an end portion of the main casing 50 through a bearing 51.
  • Brake disks 53 are alternately splined to both of an outer peripheral surface of a base-end flange portion 52 of the drive shaft 44 and an inner peripheral surface of an intermediate portion of the main casing 50 to make it possible to rotate the former and the latter together when the brake disks 53 are pressed to each other by actuating a piston 54 slidably mounted in the other end portion in the interior of the main casing 50.
  • a brake mechanism of the reduction-gear mechanism 36 has the above construction.
  • An end cover 57 is fixedly mounted on an end surface 50a of the main casing 50, which end surface 50a is disposed in a position near the base-end portion of the drive shaft 44 as shown in FIG. 3.
  • a concave guide portion 58 which is symmetrical with respect to the axis of the drive shaft 44 and extends in parallel therewith.
  • the concave guide portion 58 is constructed of: a pair of guiding side surfaces 58a extending in parallel with each other; and an arc-shaped curved guiding bottom surface 58b formed between the pair of the guiding side surfaces 58a.
  • a valve plate 59 is swingable along the concave guide portion 58.
  • Opposite side surfaces 59a of the valve plate 59 are brought into contact with the guiding side surfaces 58a of the concave guide portion 58, while an arc-shaped bottom surface 59b of the valve plate 59 is brought into contact with the guiding bottom surface 58b of the concave guide portion 58.
  • An end portion of a center shaft 61 rotatably mounted in a cylinder block is rotatably mounted in the valve plate 59.
  • Both of a ball-like portion 61a of the center shaft 61 and a ball-like portion 63a of each of the pistons 63 slidably inserted into cylinder bores 62 of the cylinder block 60 are swingably mounted in ball-like concave portions 64 of the end surface 52a of the base-end flange portion 52 of the drive shaft 44 through a holding plate 65.
  • the cylinder block 60 is pressed against a front surface 59c of the valve plate 59 by a spring 66.
  • a bore 67 is so formed in the end cover 57 as to extend in a direction perpendicular to the axis of the drive shaft 44, whereby the bore 67 is oppositely disposed from the drive shaft 44.
  • An axial central portion of the bore 67 opens into the guide portion 58 in a notch portion 68 of the end cover 57.
  • a base portion 71a of a pin 71 is fixedly mounted in a small bore 70 formed in an axial central portion of a piston lever 69 slidably mounted in the bore 67, which pin 71 is fixed to the small bore 70 by means of a plate 72 and a screw 73 as shown in FIG. 3.
  • a front-end portion of the pin 71 assumes a ball-like form and extends forward from the notch portion 68 of the end cover 57 so as to be slidably mounted in a cylindrical bore 74 which is formed in an end portion of the valve plate 59, the end portion being disposed in a position near the axis of the drive shaft 44.
  • a blank plug 75 is threadably engaged with opposite end portions of the bore 67 to form a first chamber 76 and a second chamber 77 which are communicated with the above opposite end portions of the bore 67 at opposite end surfaces 69a and 69b, respectively.
  • the piston lever 69 is slidably moved upward or downward in FIG. 3 to move the pin 71 vertically, so that the valve plate 59 is moved along the concave guide portion 58 in a swinging manner, whereby the axis of the cylinder block 60 forms a tilt angle with the axis of the drive shaft 44, which tilt angle is variable.
  • FIG. 5 is a diagram of a hydraulic circuit for the hydraulic drive motor M'.
  • a pressurized oil is supplied from a port 80 to the pressure chamber 56 of the above-mentioned brake mechanism.
  • each of a first oil passage 81 and a second oil passage 82 is communicated with the variable displacement hydraulic motor M' while communicated with a by-pass passage 84 which is provided with a pair of check valves 83.
  • the by-pass passage 84 is so controlled through a pilot valve 85 as to be communicated with a first 86 and a second 87 oil ports.
  • the first oil port 86 is communicated with the first chamber 76 of the piston lever 69, while the second oil port 87 is communicated with the second chamber 77 of the piston lever 69.
  • the pilot valve 85 is normally held in its first position “I” by means of a spring 88.
  • a pressurized oil is supplied to a pressure portion 85a of the pilot valve 85 through a pilot channel 89, the pilot valve 85 is moved to its second position "I".
  • the pilot valve 85 returns to its first position "I”.
  • the pressurized oil contained in one of the oil passages 81 and 82 is supplied to the first chamber 76 of the piston lever 69, the piston lever 69 is moved downward in FIG. 3, to make the tilt angle of the valve plate 59 maximum.
  • the pilot valve 85 When the pressurized oil is supplied to the pressure portion 85a of the pilot valve 85 through a pilot channel 89, the pilot valve 85 is moved to its second position "I" so that the pressurized oil contained in one of the first 81 and the second 82 oil passages are supplied to the second chamber 77, whereby the piston lever 69 is slidably moved upward in the bore 67 in FIG. 3 so as to make the tilt angle of the valve plate minimum.
  • the port 80, the first 81 and the second 82 oil passages, the by-pass passage, the first 86 and the second 87 oil channels and the pilot channel 89 are formed in the main casing 50 and the end plate 57.
  • both of the check valves 83 and the pilot valve 85 are disposed between the main casing 50 and the end cover 57.
  • variable displacement hydraulic motor of the present invention in contrast with the conventional hydraulic motor, there is no need to mount the end cover obliquely on the main casing through the motor casing, and it is possible to directly mount the end cover 57 on the main casing 50 so as to be perpendicular to the axis of the drive shaft 44, which makes it possible to decrease the overall length of the hydraulic motor M'. Consequently, in case that the hydraulic motor M' is mounted on a sprocket-drive portion of the power shovel, there is no fear that the end cover 57 projects outward from the truck frame and interfers with the truck frame itself. Consequently, there is no need to introduce a special machining operations in manufacturing of the hydraulic motor M' of the present invention to make it possible to easily mount the hydraulic motor M' of the present invention on the power shovel.
  • the end cover 57 is so arranged as to be perpendicular to the axis of the drive shaft 44, it is possible to mount the end cover 57 on the main casing in an easy manner. Further, it is also possible to form the main casing 50 into a simple cylindrical form having no oblique portion, which makes it possible to easily assemble and machine the hydraulic motor M' of the present invention in its manufacturing.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)
US07/299,922 1987-03-20 1988-11-18 Variable displacement hydraulic motor Expired - Fee Related US4951551A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP62064382A JPS63235672A (ja) 1987-03-20 1987-03-20 可変容量型油圧モ−タ
JP62-64382 1987-03-20

Publications (1)

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US4951551A true US4951551A (en) 1990-08-28

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ID=13256702

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/299,922 Expired - Fee Related US4951551A (en) 1987-03-20 1988-11-18 Variable displacement hydraulic motor

Country Status (5)

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US (1) US4951551A (ja)
EP (1) EP0305548B1 (ja)
JP (1) JPS63235672A (ja)
DE (1) DE3889605T2 (ja)
WO (1) WO1988007133A1 (ja)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5467597A (en) * 1992-02-27 1995-11-21 Linde Aktiengesellschaft Hydromechanical transmission
US6360647B1 (en) * 1998-04-17 2002-03-26 Parker Hannifin Ab Hydraulic rotating axial piston engine
US20040173089A1 (en) * 2003-03-06 2004-09-09 Gray Charles L. High-efficiency, large angle, variable displacement hydraulic pump/motor
US20090290996A1 (en) * 2005-11-24 2009-11-26 Komatsu Ltd Bent Axis Type Variable Displacement Pump/Motor
US20100199837A1 (en) * 2009-02-06 2010-08-12 Government Of The Usa, As Represented By The Administrator Of The U.S. Epa Variable length bent-axis pump/motor
US20110138996A1 (en) * 2009-12-15 2011-06-16 Njegos Maric-Colic Axial piston machine
US20140150641A1 (en) * 2012-12-04 2014-06-05 Robert Bosch Gmbh Axial piston machine having a conical piston
US20150122116A1 (en) * 2012-04-24 2015-05-07 Komatsu Ltd. Bent axis type axial piston motor
US20160377135A1 (en) * 2015-06-29 2016-12-29 Deere & Company Drive assembly with multi-function actuator for motor and brake control

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024143913A (ja) * 2023-03-31 2024-10-11 株式会社クボタ 油圧装置および作業車

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007662A (en) * 1975-01-17 1977-02-15 Hydromatik Gmbh Axial piston machine of oblique-axle construction with tiltable cylinder drum
GB2043181A (en) * 1979-02-28 1980-10-01 Hemscheidt Maschf Hermann Shaft bearing system
DE3217484A1 (de) * 1981-05-13 1982-12-09 Linde Ag, 6200 Wiesbaden Triebflanschaxialkolbenmaschine mit in lagern gelagerter triebwelle
US4434709A (en) * 1979-02-23 1984-03-06 Grelsson Bo L Axial piston pump
DE3526496A1 (de) * 1985-07-24 1987-01-29 Linde Ag Axialkolbenmaschine in schwenkschlittenbauform
JPH033973A (ja) * 1989-05-30 1991-01-10 Mitsubishi Electric Corp 内燃機関配電器用配電子電極の製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56133973U (ja) * 1980-03-13 1981-10-12
DE3119994A1 (de) * 1980-05-22 1982-03-11 Moskovskij mašinostroitel'nyj zavod imeni Kalinina, Moskva Hydraulische axialkolben-verstellpumpe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007662A (en) * 1975-01-17 1977-02-15 Hydromatik Gmbh Axial piston machine of oblique-axle construction with tiltable cylinder drum
US4434709A (en) * 1979-02-23 1984-03-06 Grelsson Bo L Axial piston pump
GB2043181A (en) * 1979-02-28 1980-10-01 Hemscheidt Maschf Hermann Shaft bearing system
DE3217484A1 (de) * 1981-05-13 1982-12-09 Linde Ag, 6200 Wiesbaden Triebflanschaxialkolbenmaschine mit in lagern gelagerter triebwelle
DE3526496A1 (de) * 1985-07-24 1987-01-29 Linde Ag Axialkolbenmaschine in schwenkschlittenbauform
JPH033973A (ja) * 1989-05-30 1991-01-10 Mitsubishi Electric Corp 内燃機関配電器用配電子電極の製造方法

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5467597A (en) * 1992-02-27 1995-11-21 Linde Aktiengesellschaft Hydromechanical transmission
US6360647B1 (en) * 1998-04-17 2002-03-26 Parker Hannifin Ab Hydraulic rotating axial piston engine
US20040173089A1 (en) * 2003-03-06 2004-09-09 Gray Charles L. High-efficiency, large angle, variable displacement hydraulic pump/motor
US7014429B2 (en) 2003-03-06 2006-03-21 The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency High-efficiency, large angle, variable displacement hydraulic pump/motor
US20090290996A1 (en) * 2005-11-24 2009-11-26 Komatsu Ltd Bent Axis Type Variable Displacement Pump/Motor
US8356547B2 (en) * 2009-02-06 2013-01-22 The United States Of America, As Represented By The Administrator Of The U.S. Environmental Protection Agency Variable length bent-axis pump/motor
CN102308089A (zh) * 2009-02-06 2012-01-04 美国国家环境保护局 可变长度的弯曲轴线式泵/马达
US20100199837A1 (en) * 2009-02-06 2010-08-12 Government Of The Usa, As Represented By The Administrator Of The U.S. Epa Variable length bent-axis pump/motor
US20110138996A1 (en) * 2009-12-15 2011-06-16 Njegos Maric-Colic Axial piston machine
US20150122116A1 (en) * 2012-04-24 2015-05-07 Komatsu Ltd. Bent axis type axial piston motor
US9249664B2 (en) * 2012-04-24 2016-02-02 Komatsu Ltd. Bent axis type axial piston motor
US20140150641A1 (en) * 2012-12-04 2014-06-05 Robert Bosch Gmbh Axial piston machine having a conical piston
CN103850905A (zh) * 2012-12-04 2014-06-11 罗伯特·博世有限公司 具有锥形活塞的轴向活塞机
CN103850905B (zh) * 2012-12-04 2018-11-13 罗伯特·博世有限公司 具有锥形活塞的轴向活塞机
US20160377135A1 (en) * 2015-06-29 2016-12-29 Deere & Company Drive assembly with multi-function actuator for motor and brake control
US9908515B2 (en) * 2015-06-29 2018-03-06 Deere & Company Drive assembly with multi-function actuator for motor and brake control

Also Published As

Publication number Publication date
DE3889605D1 (de) 1994-06-23
EP0305548B1 (en) 1994-05-18
JPS63235672A (ja) 1988-09-30
EP0305548A1 (en) 1989-03-08
EP0305548A4 (en) 1990-01-08
WO1988007133A1 (en) 1988-09-22
DE3889605T2 (de) 1994-09-01

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Owner name: KABUSHIKI KAISHA KOMATSU SEISAKUSHO, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:ARAI, MITSURU;NAGAHARA, YOSHIKAZU;REEL/FRAME:005027/0990

Effective date: 19881024

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Effective date: 19980828

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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362